Nanocrystalline body-centred cubic beta-titanium alloy processed by high-pressure torsion

Wei Xu; Xiaolin Wu; Roberto B. Figueiredo; Mihai Stoica; Mariana Calin; Jürgen Eckert; Terence G. Langdon; Kenong Xia

doi:10.3139/146.110229

Published by De Gruyter June 11, 2013

Nanocrystalline body-centred cubic beta-titanium alloy processed by high-pressure torsion

Wei Xu , Xiaolin Wu , Roberto B. Figueiredo , Mihai Stoica , Mariana Calin , Jürgen Eckert , Terence G. Langdon and Kenong Xia

From the journal International Journal of Materials Research

https://doi.org/10.3139/146.110229

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Abstract

Processing by high-pressure torsion at room temperature was employed to achieve a uniform nanostructure in a metastable Ti_67.4Nb_24.6Zr₅Sn₃ bcc β alloy with grains of ∼20 − 60 nm after five turns. By comparison, there was an ultrafine grain structure after equal-channel angular pressing at 903 K. The majority of refined grains were identified as bcc β-titanium with the presence of a small fraction of orthorhombic α″ martensite. It is proposed that the pronounced grain refinement is facilitated by a stress-/strain-induced β → α″ martensitic transformation. However, the presence of a large fraction of β phase in the high-pressure torsion processed samples is attributed to a reverse α″ → β martensitic transformation stimulated by the applied shear stress and the inhibition effect of the nanoscale grains on martensite formation.

Keywords: Ultrafine/nanoscale microstructure; Martensitic transformation; Beta-titanium alloys; Equal-channel angular pressing; High-pressure torsion

* Correspondence address Dr. Wei Xu, Department of Mechanical Engineering, University of Melbourne VIC 3010, Australia. Tel.: +61-3-8344 4197, Fax: +61-3-9347 8784, E-mail: weixu@unimelb.edu.au

† Assoc. Prof. Kenong Xia, Department of Mechanical Engineering, University of Melbourne VIC 3010, Australia Tel.: +61-3-8344 6664, Fax: +61-3-9347 8784, E-mail: k.xia@unimelb.edu.au

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Received: 2009-4-2

Accepted: 2009-9-7

Published Online: 2013-06-11

Published in Print: 2009-12-01

Nanocrystalline body-centred cubic beta-titanium alloy processed by high-pressure torsion

Abstract

References

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